The earliest icon forms of St. Christopher depict him as a young, beardless man holding a staff with shoots sprouting from the top (photos forthcoming). Later iconography from the 16th century onward in both Greece and Russia has traditionally depicted him with a dog’s head:

The following articles provide very interesting analysis of the icons:

Understanding the Dog-Headed Icon of St. Christopher (part 1 & part 2)

Did Alexander the Great really make a speech at Opis proclaiming brotherly love among peoples and the equality of Greek and Barbarian? Well, not exactly. What is commonly called the “Speech at Opis” was a literary creation by the Greek author Christos Zalokostas which first appeared in his 1971 book, Alexander the Great, Forerunner of Christ. However, this does not mean that the ideas expressed in Zalokostas’ text are completely baseless historically:

The following is a comparison between St. Constantine the Great’s Greek translation of Vergil’s Fourth Eclogue (taken from Eusebius’ Life of Constantine) and the Latin original. Significant discrepancies highlighted: